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Fix a possible race where the directory dirent is moved to the location

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that was used by ".." entry.
This change seems fixed panic during attempt to access msdosfs data
over nfs.

Reviewed by:	kib
MFC after:	1 week
This commit is contained in:
Kevin Lo 2010-10-18 03:34:33 +00:00
parent 34c9624e2d
commit 4bc8fad7bd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=214001
1 changed files with 8 additions and 3 deletions
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11
sys/fs/msdosfs/msdosfs_lookup.c
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@ -594,10 +594,15 @@ msdosfs_deget_dotdot(struct vnode *vp, u_long cluster, int blkoff,
vfs_unbusy(mp);
if (error == 0)
*rvp = DETOV(rdp);
vn_lock(vp, ltype | LK_RETRY);
if (*rvp != vp)
vn_lock(vp, ltype | LK_RETRY);
if (vp->v_iflag & VI_DOOMED) {
if (error == 0)
vput(*rvp);
if (error == 0) {
if (*rvp == vp)
vunref(*rvp);
else
vput(*rvp);
}
error = ENOENT;
}
return (error);